In 1972, the I.R.A. abducted and “disappeared” Jean McConville,

the mother of ten children, most

of whom were teen-age or younger.

Her case became one of the most

notorious unsolved murders of the

long period of unrest in Northern

Ireland known as the Troubles.

While researching for his new book

“Say Nothing,” Patrick Radden Keefe

stumbled across an overlooked clue.

He’s pretty sure now he knows who

murdered McConville.